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聚苯乙烯微塑料对污水中胞外耐药基因的影响及其机制
摘要点击 495  全文点击 102  投稿时间:2023-07-28  修订日期:2023-09-11
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中文关键词  微塑料(MPs)  聚苯乙烯(PS)  胞外耐药基因(feARGs)  污水  影响机制
英文关键词  microplastics (MPs)  polystyrene (PS)  free extracellular antibiotic resistance genes (feARGs)  wastewater  influencing mechanism
作者单位E-mail
周帅 南华大学污染控制与资源化技术湖南省高校重点实验室, 衡阳 421001
南华大学土木工程学院, 衡阳 421001
南华大学稀有金属矿产开发与废物地质处置技术湖南省重点实验室, 衡阳 421001 
zs402606665@126.com 
黄啊潮 南华大学土木工程学院, 衡阳 421001  
黄泽枫 南华大学土木工程学院, 衡阳 421001  
李伦福 南华大学土木工程学院, 衡阳 421001  
杨锋娟 南华大学土木工程学院, 衡阳 421001  
陈安琪 南华大学土木工程学院, 衡阳 421001  
修斐晨 南华大学衡阳医学院病原生物学研究所, 衡阳 421001  
高媛媛 南华大学污染控制与资源化技术湖南省高校重点实验室, 衡阳 421001
南华大学稀有金属矿产开发与废物地质处置技术湖南省重点实验室, 衡阳 421001 
yzhiyouy@126.com 
中文摘要
      微塑料(MPs)和抗生素耐药基因(ARGs)是共存于污水处理厂中的典型新污染物.MPs已被证明能够改变污泥中ARGs的分布模式,但其对污水中胞外ARGs(feARGs)的影响及机制仍不清楚.采用荧光定量PCR技术探究了典型MPs(聚苯乙烯PS)暴露60 d后污水中feARGs(包括tetCtetOsul1sul2)的动态变化特征及机制.结果表明,四环素类feARGs绝对丰度在nm级和mm级PS暴露下分别降低了28.4 %~76.0 %和35.2 %~96.2 %,在μm级PS暴露下变化了-55.4 %~122.4 %.PS对磺胺类sul1的促进效果呈nm级 > μm级 > mm级趋势,且ρ(PS)为50 mg·L-1sul1丰度扰动幅度更大.磺胺类sul2的相对丰度在μm级和mm级PS暴露后分别削减了25.4 %~42.6 %和46.1 %~90.3 %,在nm级PS暴露后增加了1.9~3.9倍;ρ(PS)为50 mg·L-1sul2的削减作用高于ρ(PS)为0.5 mg·L-1.Pearson相关性分析显示,PS暴露下feARGs相对丰度与细胞膜通透性和典型可移动遗传元件(intI1)丰度成正相关,与活性氧水平成负相关.研究结果阐明了PS对污水中feARGs的影响及其机制,可为污水中MPs与ARGs复合污染的防治提供科学依据.
英文摘要
      Microplastics (MPs) and antibiotic resistance genes (ARGs) are typical co-existing emerging pollutants in wastewater treatment plants. MPs have been shown to alter the distribution pattern of ARGs in sludge, but their effects on free extracellular ARGs (feARGs) in wastewater remain unclear. In this study, we used fluorescence quantitative PCR to investigate the dynamics of feARGs (including tetC, tetO, sul1, and sul2) in wastewater and their transition mechanisms after 60 d of exposure to typical MPs (polystyrene, PS). The results showed that the absolute abundance of tetracycline feARGs decreased by 28.4 %-76.0 % and 35.2 %-96.2 %, respectively, under nm-level and mm-level PS exposure and changed by -55.4 %-122.4 % under μm-level PS exposure. The abundance of sul1 showed a trend of nm-level > μm-level > mm-level upon PS exposure, and the changes in sul1 abundance was greater with ρ(PS)=50 mg·L-1 exposure. The relative abundance of sul2 was reduced by 25.4 %-42.6 % and 46.1 %-90.3 % after μm-level and mm-level PS exposure, respectively, and increased by 1.9-3.9 times after nm-level PS exposure, and the sul2 showed a higher reduction at ρ (PS)=50 mg·L-1 exposure than that at ρ (PS)=0.5 mg·L-1. The Pearson correlation analysis showed that the relative abundance of feARGs during PS exposure was positively correlated with cell membrane permeability and typical mobile genetic elements (intI1) abundance and negatively correlated with reactive oxygen species level. Our findings elucidated the effects and corresponding mechanisms of PS on the growth and mobility of feARGs in wastewater, providing a scientific basis for the control of the combined MPs and ARGs pollution in wastewater.

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